Processes for preparing aqueous polymer emulsions

ABSTRACT

This invention relates to processes for preparing aqueous polymer emulsions useful as thickening agents in aqueous compositions in which plating and/or grit formation is reduced in said processes. This invention also relates to methods for reducing plating and/or grit formation in processes for preparing aqueous polymer emulsions useful as thickening agents in aqueous compositions. This invention further relates to polymers which are soluble in, or swelled by, an aqueous alkaline medium to provide thickeners for use in aqueous coating compositions, especially latex paints.

This application is a division of prior U.S. application Ser. No. 08/342,147 filed on Nov. 18, 1994, now U.S. Pat. No. 5,436,292, and/which is a divisional of application 08/083,896 filed on Jun. 28, 1993, now U.S. Pat. No. 5,399,618.

RELATED APPLICATIONS

The following is a related, commonly assigned application, filed on an even date herewith:

U.S. patent application Ser. No. 08/083,352, pending, which is incorporated herein by reference.

BRIEF SUMMARY OF THE INVENTION

1. Technical Field

This invention relates to processes for preparing aqueous polymer emulsions useful as thickening agents in aqueous compositions in which plating and/or grit formation is reduced in said processes. This invention also relates to methods for reducing plating and/or grit formation in processes for preparing an aqueous polymer emulsions useful as thickening agents in aqueous compositions. This invention further relates to polymers which are soluble in, or swelled by, an aqueous alkaline medium to provide thickeners for use in aqueous coating compositions, especially latex paints.

2. Background of the Invention

Processes for preparing alkali soluble aqueous polymer emulsions useful as thickeners are known in the art. Because such alkali soluble aqueous polymer emulsions useful as thickeners contain large amounts of carboxyl-functional monomer and also a monomer having surfactant characteristics, their production has proven to be difficult. In particular, during the polymerization process, some of the polymer plates out on the reactor walls and other reactor surfaces and grit particles form in the aqueous polymer emulsion product.

While some prior art processes have addressed this problem, see, for example, U.S. Pat. No. 4,801,671, such processes have not proven satisfactory from a commercial standpoint. It has long been desired to provide a process for producing alkali soluble aqueous polymer emulsions useful as thickeners in which plating and grit formation is minimized or eliminated during the process.

DISCLOSURE OF THE INVENTION

This invention relates in part to a process for preparing an aqueous polymer emulsion useful as a thickening agent in aqueous compositions in which plating and/or grit formation is reduced in said process, which comprises copolymerizing in aqueous emulsion:

(a) about 1-99.8 weight percent of one or more alpha, beta-monoethylenically unsaturated carboxylic acids;

(b) about 0-98.8 weight percent of one or more monoethylenically unsaturated monomers different from component (a);

(c) about 0.1-98.9 weight percent of one or more monoethylenically unsaturated macromonomers different from components (a and (b);

(d) about 0-20 weight percent or greater of one or more polyethylenically unsaturated monomers different from components (a), (b) and (c); and

(e) one or more acrylates and/or methacrylates derived from a strong acid or a salt of a strong acid different from components (a), (b), (c) and (d) in an amount sufficient to reduce plating and/or grit formation in said process, preferably from about 0.1-25 weight percent.

This invention also relates in part to a method for reducing plating and/or grit formation in a process for preparing an aqueous polymer emulsion useful as a thickening agent in aqueous compositions, which comprises copolymerizing in aqueous emulsion:

(a) about 1-99.8 weight percent of one or more alpha, beta-monoethylenically unsaturated carboxylic acids;

(b) about 0-98.8 weight percent of one or more monoethylenically unsaturated monomers different from component (a);

(c) about 0.1-98.9 weight percent of one or more monoethylenically unsaturated macromonomers different from components (a) and (b);

(d) about 0-20 weight percent or greater of one or more polyethylenically unsaturated monomers different from components (a), (b) and (c); and

(e ) one or more acrylates and/or methacrylates derived from a strong acid or a salt of a strong acid different from components (a), (b), (c) and (d) in an amount sufficient to reduce plating and/or grit formation in said process, preferably from about 0.1-25 weight percent.

This invention further relates in part to polymers comprising the reaction product of:

(a) about 1-99.8, preferably about 10-70, weight percent of one or more alpha, beta-mono-ethylenically unsaturated carboxylic acids, typically methacrylic acid;

(b) about 0-98.8, preferably about 30-85, weight percent of one or more monoethylenically unsaturated monomers different from component (a), typically ethyl acrylate;

(c) about 0.1-98.9, preferably about 5-60, weight percent of one or more monoethylenically unsaturated macromonomers different from components (a) and (b);

(d) about 0-20, preferably about 0-10, weight percent or greater of one or more polyethylenically unsaturated monomers different from components (a), (b) and (c), typically trimethylol propane triacrylate; and

(e) about 0.1-25, preferably about 0.1-2, weight percent of one or more acrylates and/or methacrylates derived from a strong acid or a salt of a strong acid different from components (a), (b), (c) and (d), typically 2-sulfoethyl methacrylate.

This invention also relates in part to an emulsion of the above-identified polymer in water, which emulsion is useful as a thickening agent in aqueous compositions. In order to obtain the thickening effect, the polymer is dissolved in the aqueous composition to be thickened.

This invention further relates in part to an aqueous composition, and more particularly an improved latex paint composition containing the above-defined polymer.

This invention yet further relates in part to a process for thickening an aqueous composition which comprises adding the above-defined polymer to an aqueous composition and dissolving the polymer in the aqueous composition.

DETAILED DESCRIPTION

A large proportion of one or more alpha, beta-monoethylenically unsaturated carboxylic acid monomers can be present in the polymers of this invention. Various carboxylic acid monomers can be used, such as acrylic acid, methacrylic acid, ethacrylic acid, alpha-chloroacrylic acid, crotenic acid, fumaric acid, citraconic acid, mesaconic acid, itaconic acid, maleic acid and the like including mixtures thereof. Methacrylic acid is preferred. A large proportion of carboxylic acid monomer is essential to provide a polymeric structure which will solubilize and provide a thickener when reacted with an alkali like sodium hydroxide.

The polymers of this invention can also contain a significant proportion of one or more monoethylenically unsaturated monomers. The preferred monomers provide water insoluble polymers when homopolymerized and are illustrated by acrylate and methacrylate esters, such as ethyl acrylate, butyl acrylate or the corresponding methacrylate. Other monomers which can be used are styrene, alkyl styrenes, vinyl toluene, acrylonitrile, vinylidene chloride and the like. Nonreactive monomers are preferred, those being monomers in which the single ethylenic group is the only group reactive under the conditions of polymerization. However, monomers which include groups reactive under baking conditions or with divalent metal ions such as zinc oxide may be used in some situations, like hydroxyethyl acrylate.

Other illustrative monoethylenically unsaturated monomers useful in this invention include, for example, propyl methacrylate, isopropyl methacrylate, butyl methacrylate, n-amyl methacrylate, sec-amyl methacrylate, hexyl methacrylate, lauryl methacrylate, stearyl methacrylate, ethyl hexyl methacrylate, crotyl methacrylate, cinnamyl methacrylate, oleyl methacrylate, ricinoleyl methacrylate, hydroxy ethyl methacrylate, hydroxy propyl methacrylate, methacryonitrile, acrylamide, methacrylamide, N-alkyl acrylamides, N-aryl acrylamides, N-vinyl pyrrolidone and the like including mixtures thereof.

The macromonomers useful in this invention can be represented by the formula: ##STR1## wherein:

R¹ is a monovalent residue of a substituted or unsubstituted hydrophobe compound or complex hydrophobe compound;

each R² is the same or different and is a substituted or unsubstituted divalent hydrocarbon residue;

R³ is a substituted or unsubstituted divalent hydrocarbon residue;

R⁴, R⁵ and R⁶ are the same or different and are hydrogen or a substituted or unsubstituted monovalent hydrocarbon residue; and

z is a value of 0 or greater.

The macromonomer compounds useful in this invention can be prepared by a number of conventional processes. Illustrative processes are described, for example, in U.S. Pat. Nos. 4,514,552, 4,600,761, 4,569,965, 4,384,096, 4,268,641, 4,138,381, 3,894,980, 3,896,161, 3,652,497, 4,509,949, 4,226,754, 3,915,921, 3,940,351, 3,035,004, 4,429,097, 4,421,902, 4,167,502, 4,764,554, 4,616,074, 4,464,524, 3,657,175, 4,008,202, 3,190,925, 3,794,608, 4,338,239, 4,939,283 and 3,499,876. The macromonomers can also be prepared by methods disclosed in copending U.S. patent application Ser. No. 07/887,645, filed May 29, 1992, under appeal, which is incorporated herein by reference.

Illustrative substituted and unsubstituted divalent hydrocarbon residues represented by R² in formula (I) above include those described for the same type of substituents in formulae (i) and (ii) below. Illustrative substituted and unsubstituted monovalent hydrocarbon residues represented by R⁴, R⁵ and R⁶ in formula (I) above include those described for the same type of substituents in formulae (i) and (ii) below.

Illustrative R³ substituents include, for example, the organic residue of ethers, esters, urethanes, amides, ureas, urethanes, anhydrides and the like including mixtures thereof. The R³ substituent can be generally described as a "linkage" between the complex hydrophobe bearing surfactant or alcohol, and the unsaturation portion of the macromonomer compound. Preferred linkages include the following: urethane linkages from the reaction of an isocyanate with a nonionic surfactant; urea linkages from the reaction of an isocyanate with an amine bearing surfactant; unsaturated esters of surfactants such as the esterification product of a surfactant with of an unsaturated carboxylic acid or an unsaturated anhydride; unsaturated esters of alcohols; esters of ethyl acrylate oligomers, acrylic acid oligomers, and allyl containing oligomers; half esters of surfactants such as those made by the reaction of a surfactant with maleic anhydride; unsaturated ethers prepared by reacting vinyl benzyl chloride and a surfactant or by reacting an allyl glycidyl ether with a surfactant, alcohol, or carboxylic acid.

The oxyalkylene moieties included in the macromonomer compounds of formula (I) may be homopolymers or block or random copolymers of straight or branched alkylene oxides. Mixtures of alkylene oxides such as ethylene oxide and propylene oxide may be employed. It is understood that each R² group in a particular substituent for all positive values of z can be the same or different.

Illustrative monovalent residues of substituted and unsubstituted hydrophobe compounds represented by R¹ in formula (I) include, for example, those substituted and unsubstituted monovalent hydrocarbon residues described for the same type of substituents in formulae (i) and (ii) below.

Illustrative monovalent residues of substituted and unsubstituted complex hydrophobe compounds represented by R¹ in formula (I) include, for example, those derived from substituted and unsubstituted complex hydrophobe compounds represented by the formula: ##STR2## wherein R₁ and R₂ are the same or different and are hydrogen or a substituted or unsubstituted monovalent hydrocarbon residue, R₃ is a substituted or unsubstituted divalent or trivalent hydrocarbon residue, each R₄ is the same or different and is a substituted or unsubstituted divalent hydrocarbon residue, each R₅ is the same or different and is a substituted or unsubstituted divalent hydrocarbon residue, R₆ is hydrogen, a substituted or unsubstituted monovalent hydrocarbon residue or an ionic substituent, a and b are the same or different and are a value of 0 or 1, and x and y are the same or different and are a value of 0 or greater; provided at least two of R₁, R₂, R₃, R₄, R₅ and R₆ are a hydrocarbon residue having greater than 2 carbon atoms in the case of R₁, R₂ and R₆ or having greater than 2 pendant carbon atoms in the case of R₃, R₄ and R₅.

Other monovalent residues of substituted and unsubstituted complex hydrophobe compounds represented by R¹ in formula (I) include, for example, those derived from substituted and unsubstituted complex hydrophobe compounds represented by the formula: ##STR3## wherein R₇ and R₈ are the same or different and are hydrogen or a substituted or unsubstituted monovalent hydrocarbon residue, R₁₁ and R₁₄ are the same or different and are hydrogen, a substituted or unsubstituted monovalent hydrocarbon residue or an ionic substituent, R₉ and R₁₂ are the same or different and are a substituted or unsubstituted divalent or trivalent hydrocarbon residue, each R₁₀ is the same or different and is a substituted or unsubstituted divalent hydrocarbon residue, each R₁₃ is the same or different and is a substituted or unsubstituted divalent hydrocarbon residue, R₁₅ is a substituted or unsubstituted divalent hydrocarbon residue, d and e are the same or different and are a value of 0 or 1, and f and g are the same or different and are a value of 0 or greater; provided at least two of R₇, R₈, R₉, R₁₀, R₁₁, R₁₂, R₁₃, R₁₄ and R₁₅ are a hydrocarbon residue having greater than 2 carbon atoms in the case of R₇, R₈, R₁₁ and R₁₄ or having greater than 2 pendant carbon atoms in the case of R₉, R₁₀, R₁₂, R₁₃ and R₁₅.

Illustrative substituted and unsubstituted monovalent hydrocarbon residues contain from 1 to about 50 carbon atoms or greater and are selected from alkyl radicals including linear or branched primary, secondary or tertiary alkyl radicals, such as methyl, ethyl, n-propyl, isopropyl, amyl, sec-amyl, t-amyl, 2-ethylhexyl and the like; aryl radicals such as phenyl, naphthyl and the like; arylalkyl radicals such as benzyl, phenylethyl, tri-phenylmethylethane and the like; alkylaryl radicals such as octylphenyl, nonylphenyl, dodecylphenyl, tolyl, xylyl and the like; and cycloalkyl radicals such as cyclopentyl, cyclohexyl, cyclohexylethyl and the like. The permissible hydrocarbon residues may contain fluorine, silicon, or other non-carbon atoms.

Preferably, the substituted and unsubstituted hydrocarbon residues are selected from alkyl and aryl radicals which contain from about 1 to 30 carbon atoms or greater. More preferably, the alkyl radicals contain from 1 to 18 carbon atoms, while the aryl: arylalkyl, alkylaryl and cycloalkyl radicals preferably contain from 6 to 18 carbon atoms or greater.

In a preferred embodiment of this invention, R₁, R₂, R₇ and R₈ can individually be a hydrocarbon radical represented by the formula: ##STR4## wherein R₁₆ and R₁₇ are as defined for R₁, R₂, R₇ and R₈ above, h and i are the same or different and are a value of 0 or 1, and R₁₈ is as defined for R₃ above. For compounds represented by formulae (i) and (ii), it is understood that each formula (iii) radical in a given compound may be the same or different and the R₁₆ and/or R₁₇ groups may themselves be a formula (iii) radical to provide complex hydrophobes of a dendritic or of a cascading nature as described below. Further, R₄, R₅, R₁₀ and R₁₃ can individually be a hydrocarbon radical represented by the formula:

    --CH[(OR.sub.19).sub.j OR.sub.20 ]--                       (iv)

wherein R₁₉ is as defined for R₄, R₅, R₁₀ and R₁₃ above, R₂₀ is as defined for R₆, R₁₁ and R₁₄ above, and j is a value of 0 or greater.

Illustrative ionic substituents for R₆, R₁₁, R₁₄ and R₂₀ include cationic and anionic substituents such as sulfates, sulfonates, phosphates and the like. R₆, R₁₁, R₁₄ and R₂₀ may preferably be an organic residue containing 1 or more hydroxyls or nitrogen derivatives or epoxides or other reactive groups which may or may not contain unsaturation.

Other illustrative terminal groups which are described by R₆, R₁₁, R₁₄ and R₂₀ include, for example, hydrocarbon residues which may contain allylic or vinylic unsaturation, acrylic or methacrylic functionality, styryl or alpha-methylstyryl functionality, and the like, such as the reaction product between the terminal alcohol (R₆, R₁₁, R₁₄ and R₂₀ =H) and glycidyl methacrylate, isocyanatoethyl methacrylate, alpha, alpha-dimethyl-m-isopropenyl benzyl isocyanate (m-TMI), and the like. Other examples of terminal groups may include hydrocarbon residues of alkyl, aryl, aralkyl, alkaryl, and cycloalkyl radicals which may or may not be substituted with one or more of the following: hydroxyl, carboxyl, isocyanato, amino, mono- or disubstituted amino, quaternary ammonium, sulfate, sulfonate, phosphate, epoxy, and the like and may or may not contain other non-carbon atoms including silicon or fluorine. Also included can be divalent siloxy radicals. Other nonhydrocarbon terminal groups may include sulfates, phosphates, and the like.

Illustrative divalent hydrocarbon residues represented by R₃, R₄, R₅, R₉, R₁₀, R₁₂, R₁₃, R₁₅, R₁₈ and R₁₉ in the above formulae include substituted and unsubstituted radicals selected from alkylene, --alkylene-oxy-alkylene--, --arylene-oxy-arylene--, arylene, alicyclic radicals, phenylene, naphthylene, --phenylene-(CH₂)_(m) (Q)_(n) (CH₂)_(m) -phenylene- and --naphthylene-(CH₂)_(m) (Q)_(n) (CH₂)m-naphthylene- radicals, wherein Q individually represents a substituted or unsubstituted divalent bridging group selected from --CR₂₁ R₂₂ --, --O--, --S--, --NR₂₃ --, --SiR₂₄ R₂₅ -- and --CO--, wherein R₂₁ and R₂₂ individually represent a radical selected from hydrogen, alkyl of 1 to 12 carbon atoms, phenyl, tolyl and anisyl; R₂₃, R₂₄ and R₂₅ individually represent a radical selected from hydrogen and methyl, and each m and n individually have a value of 0 or 1. More specific illustrative divalent radicals represented by R₃, R₄, R₅, R₉, R₁₀, R₁₂, R₁₃, R₁₅, R₁₈ and R₁₉ include, e.g., 1,1-methylene, 1,2-ethylene, 1,3-propylene, 1,6-hexylene, 1,8-octylene, 1,12-dodecylene, 1,4-phenylene, 1,8-napthylene, 1,1'-biphenyl-2,2'-diyl, 1,1'-binaphthyl-2,2'-diyl, 2,2'-binaphthyl-1,1'-diyl and the like. The alkylene radicals may contain from 2 to 12 carbon atoms or greater, while the arylene radicals may contain from 6 to 18 carbon atoms or greater. Preferably, R₃, R₄, R₅, R₉, R₁₀, R₁₂, R₁₃, R₁₅, R₁₈ and R₁₉ are an alkylene or arylene radical. The permissible divalent hydrocarbon residues may contain fluorine, silicon, or other non-carbon atoms.

Illustrative trivalent hydrocarbon residues represented by R₃, R₉, R₁₂ and R₁₈ in the above formulae include substituted and unsubstituted radicals selected from >CH--, >C(R₂₆)--, >CR₂₇ -- and the like, wherein R₂₆ is a substituted or unsubstituted monovalent hydrocarbon residue as described herein and R₂₇ is a substituted or unsubstituted divalent hydrocarbon residue as described herein.

Of course, it is to be further understood that the hydrocarbon residues in the above formulae may also be substituted with any permissible substituent. Illustrative substituents include radicals containing from 1 to 18 carbon atoms such as alkyl, aryl, aralkyl, alkaryl and cycloalkyl radicals; alkoxy radicals; silyl radicals such as --Si(R₂₈)₃ and --Si(OR₂₈)₃, amino radicals such as --N(R₂₈)₂ ; acyl radicals such as --C(O)R₂₈ ; acyloxy radicals such as --OC(O)R₂₈ ; carbonyloxy radicals such as --COOR₂₈ ; amido radicals such as --C(O)N(R₂₈)₂ and --N(R₂₈)COR₂₈ ; sulfonyl radicals such as --SO₂ R₂₈ ; sulfinyl radicals such as --SO(R₂₈)₂ ; thionyl radicals such as SR₂₈ ; phosphonyl radicals such as --P(O)(R₂₈)₂ ; as well as halogen, nitro, cyano, trifluoromethyl and hydroxy radicals and the like, wherein each R₂₈ can be a monovalent hydrocarbon radical such as alkyl, aryl, alkaryl, aralkyl and cycloalkyl radicals, with the provisos that in amino substituents such as --N(R.sub. 28 )₂, each R₂₈ taken together can also compromise a divalent bridging group that forms a heterocyclic radical with the nitrogen atom, in amido substituents such as --C(O)N(R₂₈)₂ and --N(R₂₈)COR₂₈, each R₂₈ bonded to N can also be hydrogen, and in phosphonyl substituents such as --P(O)(R₂₈)₂, one R₂₈ can by hydrogen. It is to be understood that each R₂₈ group in a particular substituent may be the some or different. Such hydrocarbon substituent radicals could possibly in turn be substituted with a permissible substituent such as already herein outlined above.

Preferred alkylene oxides which can provide random or block oxyalkylene units in the complex hydrophobe compounds represented by formulae (i) and (ii) include alkylene oxides such as ethylene oxide, propylene oxide, 1,2-butylene oxide, 2,3-butylene oxide, 1,2- and 2,3-pentylene oxide, cyclohexylene oxide, 1,2-hexylene oxide, 1,2-octylene oxide, 1,2-decylene oxide, and higher alpha-olefin epoxides; epoxidized fatty alcohols such as epoxidized soybean fatty alcohols and epoxidized linseed fatty alcohols; aromatic epoxides such as styrene oxide and 2-methylstyrene oxide; and hydroxy- and halogen-substituted alkylene oxides such as glycidol, epichlorohydrin and epibromohydrin. The preferred alkylene oxides are ethylene oxide and propylene oxide. Also included can be hydrocarbon residues from substituted and unsubstituted cyclic esters or ethers such as oxetane and tetrahydrofuran. It is understood that the compounds represented by formulae (i) and (ii) herein can contain random and/or block oxyalkylene units as well as mixtures of oxyalkylene units. It is further understood that each R₄, R₅, R₁₀, R₁₃ and R₁₉ group in a particular substituent for all positive values of x, y, f, g and j respectively can be the same or different.

The values of x, y, z, f, g and j are not narrowly critical and can vary over a wide range. For example, the values of x, y, z, f, g and j can range from 0 to about 200 or greater, preferably from about 0 to about 100 or greater, and more preferably from about 0 to about 50 or greater. Any desired mount of alkylene oxide can be employed, for example, from 0 to about 90 weight percent or greater based on the weight of the complex hydrophobe compound.

Referring to the general formulae (i) and (ii) above, it is appreciated that when R₁, R₂, R₇ and/or R₈ are a hydrocarbon residue of formulae (iii) above, the resulting compound may include any permissible number and combination of hydrophobic groups of the dendritic or cascading type. Such compounds included in the above general formulae should be easily ascertainable by one skilled in the art. Illustrative complex hydrophobe compounds having at least one active hydrogen useful in this invention and processes for preparation thereof are disclosed in copending U.S. patent application Ser. No. 07/887,648, filed May 29, 1992, allowed, which is incorporated herein by reference.

In a preferred embodiment of this invention, the structure shown in formula (iii) can be a residue of the reaction product between epichlorohydrin and an alcohol, including those alcohols whose residues can be described by formula (iii), or a phenolic, or a mixture thereof. The structures which result can be described as complex hydrophobes of a dendritic or of a cascading nature. Pictorially, they can be described as shown below: ##STR5##

Preferred macromonomer compounds useful in this invention include those represented by the formulae: ##STR6## wherein R¹, R², R⁴, R₁₉, z and j are as defined herein.

The macromonomer compounds useful in this invention can undergo further reaction(s) to afford desired derivatives thereof. Such permissible derivatization reactions can be carried out in accordance with conventional procedures known in the art. Illustrative derivatization reactions include, for example, esterification, etherification, alkoxylation, amination, alkylation, hydrogenation, dehydrogenation, reduction, acylation, condensation, carboxylation, oxidation, silylation and the like, including permissible combinations thereof. This invention is not intended to be limited in any manner by the permissible derivatization reactions or permissible derivatives of macromonomer compounds.

More particularly, the hydroxyl-terminated macromonomer compounds of this invention can undergo any of the known reactions of hydroxyl groups illustrative of which are reactions with acyl halides to form esters; with ammonia, a nitrile, or hydrogen cyanide to form amines; with alkyl add sulfates to form disulfates; with carboxylic acids and acid anhydrides to form esters and polyesters; with alkali metals to form salts; with ketenes to form esters; with acid anhydrides to form carboxylic acids; with oxygen to form aldehydes and carboxylic acids; ring-opening reactions with lactones, tetrahydrofuran; dehydrogenation to form aldehydes, isocyanates to form urethanes, and the like.

The monoethylenically unsaturated macromonomer component is subject to considerably variation within the formula presented previously. The essence of the macromonomer is a hydrophobe or complex hydrophobe carrying a polyethoxylate chain (which may include some polypropoxylate groups) and which is terminated with at least one hydroxy group. When the hydroxy-terminated polyethoxylate hydrophobe or complex hydrophobe used herein is reacted with a monoethylenically unsaturated monoisocyanate, for example, the result is a monoethylenically unsaturated urethane in which a hydrophobe or complex hydrophobe polyethoxylate structure is associated with a copolymerizable monoethylenic group via a urethane linkage.

The monoethylenically unsaturated compound used to provide the monoethylenically unsaturated macromonomer is subject to wide variation. Any copolymerizable unsaturation may be employed, such as acrylate and methacrylate unsaturation. One may also use allylic unsaturation, as provided by allyl alcohol. These, preferably in the form of a hydroxy-functional derivative, as is obtained by reacting a C₂ -C₄ monoepoxide, like ethylene oxide, propylene oxide or butylene oxide, with acrylic or methacrylic acid to form an hydroxy ester, are reacted in equimolar proportions with an organic compound, such as toluene diisocyanate or isophorone diisocyanate. The preferred monoethylenic monoisocyanates are styryl, as in alpha, alpha-dimethyl-m-isopropenyl benzyl isocyanate (m-TMI), and methacrylol isocyanate. Other suitable organic compounds include, for example, monoethylenically unsaturated esters, ethers, amides, ureas, anhydrides, other urethanes and the like.

The polymers of this invention may further be modified by introducing an amount of component (d), namely, one or more polyethylenically unsaturated copolymerizable monomers effective for crosslinking, such as diallylphthalate, divinylbenzene, allyl methacrylate, trimethylol propane triacrylate, ethyleneglycol diacrylate or dimethacrylate, 1,6-hexanediol diacrylate or dimethylacrylate, diallyl benzene, and the like. Thus, from about 0.05 or less to about 20% or greater of such polyethylenically unsaturated compound based on total weight of monomer may be included in the composition forming the polymer. The resulting polymers are either highly branched or in the form of three-dimensional networks. In the neutralized salt form, those networks swell in an aqueous system to act as a highly efficient thickener.

Other illustrative polyethylenically unsaturated monomers useful in this invention include, for example, any copolymerizable compound which contains two or more nonconjugated points of ethylenic unsaturation or two or more nonconjugated vinylidene groups of the structure, CH₂ ═C═, such as divinyltoluene, trivinylbenzene, divinylnaphthalene, trimethylene glycol diacrylate or dimethacrylate, 2-ethylhexane-1,3-dimethyacrylate, divinylxylene, divinylethylbenzene, divinyl ether, divinyl sulfone, allyl ethers of polyhdric compounds such as of glycerol, pentaerythritol, sorbitol, sucrose and resorcinol, divinylketone, divinylsulfide, allyl acrylate, diallyl maleate, diallyl fumarate, diallyl phthalate, diallyl succinate, diallyl carbonate, diallyl malonate, diallyl oxalate, diallyl adipate, diallyl sebacate, diallyl tartrate, diallyl silicate, triallyl tricarballylate, triallyl aconitate, triallyl citrate, triallyl phosphate, N,N-methylenediacrylamide, N,N'-methylenedimethacrylamide, N,N'-ethylidenediacrylamide and 1,2-di-(a-methylmethylenesulfonamide)-ethylene.

The polymers of this invention also include an amount of component (e), namely one or more acrylates and/or methacrylates derived from a strong acid or a salt of a strong acid. As used herein, "strong acid(s)" shall mean those acids fully dissociated at a pH of 2 and shall include, for example, sulfonic acid and the like. Illustrative acrylates and methacrylates derived from a strong acid or a salt of a strong acid include, for example, 2-sulfoethyl methacrylate, 3-sulfopropyl methacrylate, 3-sulfopropyl acrylate, and the like. Suitable salts include, for example, the sodium, potassium, ammonium, etc., salt of the strong acid. The acrylates and methacrylates derived from a strong acid or a salt of a strong acid are employed in the emulsion polymerization process in an amount sufficient to reduce plating and/or grit formation during said process, preferably from about 0.1 to about 25 weight percent, more preferably from about 0.1 to about 10 weight percent, and most preferably from about 0.1 to about 2.0 weight percent.

The use of acrylates and/or methacrylates derived from a strong acid or a salt of a strong acid in a process for preparing an aqueous polymer emulsion useful as a thickening agent in aqueous compositions significantly reduces both waste polymer ("scrap") in the form of reactor residue ("plating") and the formation of large particle size suspended aggregates ("grit") in the aqueous polymer emulsion products. Such plating and grit can jeopardize the commercial and economic viability of a process or product. This invention provides for economical high solids processes, and greatly enhances the mechanical, heat-age and shelf stability of latexes without adversely affecting the film properties of paints that contain the thickeners. While not wishing to be bound to any particular theory, it is believed that the acrylates and/or methacrylates of strong adds or salts of strong adds provide ionized or ionizable groups on the polymer particle surface making the polymer particle more resistant to flocculation or agglomeration caused by shear forces and added ionic agents, e.g., initiators and surfactants, and thereby reducing plating and/or grit formation. The aqueous polymer emulsions of this invention have sufficient electrostatic repulsive forces between the polymer particles to provide improved mechanical stability to the emulsion and reduced reactor fouling, i.e., reduced polymer scrap.

The polymers of this invention can be prepared via a variety of polymerization techniques known to those skilled in the art, provided such polymerization techniques impart (i) colloidal stabilization to the polymer particles and (ii) a medium wherein electrostatic interaction of the polymer particles can take place. The technique of polymerization influences the microstructure, monomer sequence distribution in the polymer backbone and its molecular weight to influence the performance of the polymer. Illustrative polymerization techniques include, for example, conventional and staged aqueous emulsion polymerization via batch, semi-continuous, or continuous processes, miniemulsion and microemulsion polymerization, aqueous dispersion polymerization, interfacial polymerization, aqueous suspension polymerization, and the like.

For purposes of this invention, the terms "aqueous emulsion", "aqueous emulsion polymerization", and like terms, are contemplated to include all those polymerizations which provide (i) colloidal stabilization of the polymer particles and (ii) a medium wherein electrostatic interaction of the polymer particles can take place. As used herein, the term "aqueous polymer emulsions", and like terms, are contemplated to include all those polymer products prepared by aqueous emulsion or aqueous emulsion polymerization.

The thickeners of this invention possess structural attributes of two entirely different types of thickeners (those which thicken by alkali solubilization of a high molecular weight entity, and those which thicken due to association), and this may account for the superior thickener properties which are obtained herein.

To obtain an estimate of thickening efficiency, the product can be diluted with water to about 1% solids content and then neutralized with alkali. The usual alkali is ammonium hydroxide, but sodium and potassium hydroxide, and even amines, like triethylamine, may be used for neutralization. The neutralized product dissolves in the water to provide an increase in the viscosity. In the normal mode of addition, the unneutralized thickener is added to a paint and then neutralized. This facilitates handling the thickener because it has a lower viscosity before neutralization. This procedure also makes more water available for the paint formulation.

The polymers of this invention are preferably produced by conventional aqueous emulsion polymerization techniques, using appropriate emulsifiers for emulsifying the monomers and for maintaining the polymer obtained in a suitable, dispersed condition. Commonly used anionic surfactants such as sodium lauryl sulfate, dodecylbenzene sulfonate and ethoxylated fatty alcohol sulfate can be used as emulsifiers. The emulsifier may be used in a proportion of 1/2 to 6% of the weight monomers.

Preferably, water-soluble initiators such as alkali metal or ammonium persulfate are used in amounts from 0.01 to 1.0% on the weight of monomers. A gradual addition thermal process employed at temperatures between 60° C. to 100° C. is preferred over redox systems.

The polymerization system may contain small amounts (0.01 to 5% by weight, based on monomer weight) of the chain transfer agent mercaptans such as hydroxyethyl mercaptan, B-mercaptopropionic acid and alkyl mercaptans containing from about 4 to 22 carbon atoms, and the like. The use of mercaptan modifier reduces the molecular weight of the polymer.

In an embodiment of this invention, the emulsion polymerization is carried out in the presence of one or more buffers. Illustrative buffers useful in this invention include, for example, sodium acetate, sodium bicarbonate, potassium carbonate and the like. The buffers are employed in the emulsion polymerization process in an amount sufficient to reduce plating and/or grit formation during said process, preferably from about 0.01 to about 1.0 weight percent, more preferably from about 0.1 to about 0.5 weight percent.

The polymer may be utilized in a variety of ways to provide the thickener or thickened compositions of this invention. For example, the polymer, while in aqueous dispersion or dry form, may be blended into an aqueous system to be thickened followed by addition of a neutralizing agent. Alternatively, the polymer may first be neutralized in aqueous dispersion form and then blended with the aqueous system. Preferably, if co-thickening by a surfactant is desired, the components are separately blended (as dry components or as dispersions or slurdes) into an aqueous dispersion to be thickened, followed by the neutralization step. Although aqueous concentrates of the polymer in acid form and the surfactant may be formed and added to an aqueous dispersion to be thickened as needed, followed by neutralization, such concentrates tend to be too viscous for easy handling. It is nevertheless possible to prepare either a dry blend or an aqueous, high solids composition which is sufficiently low in viscosity as to be pumpable or pourable, and then to further thicken the admixture by addition of an alkaline material.

The polymer thickener my be provided in a dry state in number of ways. For example, the unneutralized polymer may be spray or drum dried and, if desired, blended with a surfactant co-thickener. However, it is also possible to spray dry or otherwise dehydrate the neutralized polymer thickener, and then reconstitute the aqueous thickener dispersion at a future time and place by agitation in a aqueous medium, provided the pH of the dispersion is maintained at pH 7 or higher.

The more usual method of application of the dispersion of this invention for aqueous thickening is to add the aqueous dispersion of the polymer to the medium to be thickened and, after mixing, to introduce an alkaline material to neutralize the acid. The major portion of the thickening effect is obtained in a few minutes upon neutralization. In the presence of high concentrations of electrolytes, the viscosity development may take much longer. This method of applying a polymer to an aqueous system before neutralization enables one to handle a high solids thickener in a non-viscous state, to obtain uniform blend, and then to convert to a highly viscous condition by the simple addition of an alkaline material to bring the pH of the system to 7 or above.

The aqueous solutions thickened with the neutralized polymers of this invention exhibit good viscosity stability even at a pH as high as 13.

The polymer may be used to thicken compositions under acidic conditions in the presence of a relatively large amount of surfactants wherein the thickened composition, for example, an aqueous system, has a pH below 7, even as low as 1.

An enhancement of thickening (herein termed "co-thickening") can result upon the addition of a surfactant to an aqueous system containing the polymer of this invention, when the polymer is neutralized. In some cases the thickening can be enhanced up to about 40 times the viscosity afforded by the neutralized polymer alone. A wide range of surfactants may be used. Although trace amounts of surfactant may be residually present from the polymerization of the monomers comprising the polymer (for example, whatever may remain of the about 1.5 weight percent surfactant on monomers), such amounts of surfactant are not believed to result in any measurable co-thickening.

On the basis of an aqueous system containing about 0.1 to 5% by weight of polymer solids, a useful amount of surfactant for optimum co-thickening is about 0.1 to 1.0% by weight of the total system. As indicated, the amounts of polymer and surfactant cothickener may vary widely, even outside these ranges, depending on polymer and surfactant type and other components of the aqueous system to be thickened. However, the co-thickening can reach a maximum as surfactant is added and then decreases as more surfactant is added. Hence, it may be uneconomical to employ surfactant in amounts outside the stated concentrations and polymer/surfactant ratios, but this can be determined in a routine manner in each case.

The preferred method of application of the polymer and the surfactant for aqueous thickening is to add in any sequence the polymer and the surfactant to the medium to be thickened and, after mixing, to introduce an alkaline material to neutralize the acid. This method of applying polymer and surfactant to an aqueous system before neutralization enables one to handle a high solids thickener in a non-viscous state, to obtain a uniform blend, and then to convert to a highly viscous condition by the simple addition of an alkaline material to bring the pH of the system to 7 or above. However, the polymer in the aqueous system may also be neutralized before addition of the surfactant.

The surfactants which may be used include nonionics and anionics, singly or in combination, the selection necessarily depending upon compatibility with other ingredients of the thickened or thickenable dispersions of this invention. Cationic amphoteric surfactants may also be used provided they are compatible with the polymer and other ingredients of the aqueous system, or are used in such small amounts as not to cause incompatibility.

Suitable anionic surfactants that may be used include the higher fatty alcohol sulfates such as the sodium or potassium salt of the sulfates of alcohols having from 8 to 18 carbon atoms, alkali metal salts or amine salts of high fatty acid having 8 to 18 carbon atoms, and sulfonated alkyl aryl compounds such as sodium dodecyl benzene sulfonate. Examples of nonionic surfactants include alkylphenoxypolyethoxyethanols having alkyl groups of about 7 to 18 carbon atoms and about 9 to 40 or more oxyethylene units such as octylphenoxypolyethoxyethanols, dodecylphenoxypolyethoxyethanols; ethylene oxide derivatives of long-chain carboxylic acids, such as lauric, myristic, palmitic, oleic; ethylene oxide condensates of long-chain alcohols such as lauryl or cetyl alcohol, and the like.

Examples of cationic surfactants include lauryl pyridinium chloride, octylbenzyltrimethylammonium chloride, dodecyltrimethylammonium chloride condensates of primary fatty amines and ethylene oxide, and the like.

The foregoing and numerous other useful nonionic, anionic, cationic, and amphoteric surfactants are described in the literature, such as McCutcheon's Detergents & Emulsifiers 1981 Annual, North America Edition, MC Publishing Company, Glen Rock, N.J. 07452, U.S.A., incorporated herein by reference.

In general, solvents and non-solvents (or mixtures of, solvents, non-solvents, other organics and volatiles) can be used to manipulate the viscosity of polymer containing systems. Mineral spirits can act like a co-thickener, and the water solubility of other solvents can influence how much mineral spirits can be added before the solution separates into a two phase system. The co-thickening with mineral spirits has utility in textile printing pastes, and in waterborne automotive basecoats. These systems usually contain mineral spirits (because of the pigments used therein), so that the mineral spirits provide an economical way of increasing viscosity and improving the efficiency of the thickener.

The amount of the polymer that may be dissolved in any given aqueous composition may fall within a wide range depending on the particular viscosity desired.

Thus, although any effective amount of the polymer may be employed for dissolution, typically from about 0.05 to about 20%, preferably from about 0.1 to about 5%, and most preferably from about 0.1 to about 3% by weight, based on the weight of the final aqueous composition including polymer is used.

For latex paint compositions, the polymer may be dissolved therein in an amount of from about 0.05 to about 5%, and preferably from about 0.1 to about 3% by weight, based on the weight of the total composition including polymer.

The polymers of this invention may be employed as thickeners for controlling viscosity of any aqueous based composition. An aqueous based composition is an aqueous composition as herein defined to be a composition wherein water comprises at least 10% by weight of the total composition (including 100% water).

For example, aqueous dispersions, emulsions, suspensions, solutions, slurries and the like, may be thickened by the polymers of this invention.

Typical aqueous compositions include compositions to be applied to textiles such as latex adhesives, warp sizes, backings for rugs and other pile fabrics. The polymer may also be used when thickening is desired in the purification of raw water such as the saline water used in the recovery of oil from exhausted oil wells by water flooding techniques. Other aqueous coatings compositions to which the polymer can be added for thickening purposes include drilling muds, caulks, adhesives, coating compositions such as paper coatings, furniture finishes, ink compositions, latex paints, foundary core washes, and the like.

Preferably, the polymer is used to thicken aqueous coating compositions, and more preferably latex paint compositions.

Examples of suitable latex paint compositions that can be prepared by this invention include those based on resins or binders of acrylonitrile, copolymers of acrylonitrile wherein the comonomer is a diene like isoprene, butadiene or chloroprene, homopolymers of styrene, homopolymers and copolymers of vinyl halide resins such as vinyl chloride, vinylidene chloride or vinyl esters such as vinyl acetate, vinyl acetate homopolymers and copolymers, copolymers of styrene and unsaturated acid anydrides like maleic anhydrides, homopolymers and copolymers of acrylic and methacrylic acid and their esters and derivatives, polybutadiene, polyisoprene, butyl rubber, natural rubber, ethylene-propylene copolymers, olefins resins like polyethylene and polypropylene, polyvinyl alcohol, carboxylated natural and synthetic latices, reactive latexes such as those having ethylenic unsaturation connected to the polymer through pendant flexible or dangling side chains, epoxies, epoxy esters and similar polymeric latex materials.

Latex paint compositions are well known in the art and typically comprise an emulsion, dispersion or suspension of discrete particles of resin binder and pigment in water. Optional ingredients typically include thickeners, antifoam agents, plasticizers, surfactants, coalescing agents, and the like. High solids latex compositions, i.e., up to about 50 percent by weight solids, can be prepared in accordance with this invention.

The polymers described herein are useful in a variety oft aqueous systems, such as textile coatings (woven and nonwoven), latex paint formulations, cosmetic formulations, pigment dispersions and slurries, dentrifrices, hand lotions, liquid detergents, quenchants, agricultural chemicals, concrete additives, transmission fluids, waste water treatment (flocculants), turbulent drag reduction, aircraft anti-icing, automotive coatings (OEM and refinish), architectural coatings, industrial coatings and the like. It is understood that the aqueous polymer emulsions of this invention can contain any permissible conventional additives employed in conventional amounts for the particular end-use application.

As used herein, the term "complex hydrophobe" is contemplated to include all permissible hydrocarbon compounds having 2 or more hydrophobe groups, e.g., bis-dodecylphenyl, bis-nonylphenyl, bis-octylphenyl and the like.

For purposes of this invention, the term "hydrocarbon" is contemplated to include all permissible compounds having at least one hydrogen and one carbon atom. In a broad aspect, the permissible hydrocarbons include acyclic and cyclic, branched and unbranched, carbocyclic and heterocyclic, aromatic and nonaromatic organic compounds which can be substituted or unsubstituted.

As used herein, the term "substituted" is contemplated to include all permissible substituents of organic compounds unless otherwise indicated. In a broad aspect, the permissible substituents include acyclic and cyclic, branched and unbranched, carbocyclic and heterocyclic, aromatic and nonaromatic substituents of organic compounds. Illustrative substituents include, for example, alkyl, alkyloxy, aryl, aryloxy, hydroxy, hydroxyalkyl, amino, aminoalkyl, halogen and the like in which the number of carbons can range from 1 to about 20 or more, preferably from 1 to about 12. The permissible substituents can be one or more and the same or different for appropriate organic compounds. This invention is not intended to be limited in any manner by the permissible substituents of organic compounds.

The invention is illustrated by certain of the following examples.

EXAMPLE 1 Preparation of 1,3-Bis(nonylphenoxy)-2-propanol

To a five neck, two liter round bottom flask equipped with an addition funnel, thermometer, nitrogen dispersant tube, mechanical stirrer, and a decanting head with a water-cooled condenser were added 220 grams (1.00 mole) of nonylphenol and 250 milliliters of cyclohexane. The solution was then heated to reflux and 2.8 grams (1.3 wt. % based on nonylphenol) of potassium hydroxide in 10 milliliters of water was slowly added to the flask. After essentially all the water was recovered in the decanting head (10 milliliters+1 milliliter formed), 250.7 grams (0.91 mole) of nonylphenyl glycidyl ether as added dropwise. During the addition of the glycidyl ether, the reaction temperature was maintained between 60° and 80° C. After the addition was complete, the solution was refluxed for four hours. The contents of the flask were then washed with a five percent aqueous solution of phosphoric acid, and the organic layer was separated from the water layer and washed twice with deionized water. The reaction mixture was then placed in a one liter round bottom flask, and the remaining cyclohexane and unreacted nonylphenol were recovered by distillation, first at atmospheric pressure, then under vacuum at 0.2 mm Hg. The kettle temperature was not allowed to exceed 180° C. during the distillation to prevent discoloration of the product. The concentrated solution was then refiltered to give 425 grams of a pale-yellow liquid. End-group MW analysis gave a molecular weight of 506.8 (theoretical MW=496.8). Ir and nmr spectra were identical to previously recorded spectra for the compound.

EXAMPLE 2 Preparation of 1,3-Bis(nonylphenoxy)-2-propanol

To a five neck, two liter round bottom flask, equipped with an addition funnel, thermometer, nitrogen dispersant tube, mechanical stirrer, and a decanting head with a water-cooled condenser, were added 300 milliliters of cyclohexane and 451.7 grams (2.05 mole) of nonylphenol. The solution was then heated to reflux and 58.9 grams (1.05 mole) of potassium hydroxide in 60 milliliters of water was slowly added via the addition funnel. After essentially all the water was recovered in the decanting head (60 milliliters+19 milliliters formed), the reaction was cooled to 40° C., and 92.5 grams (1.00 mole ) of epichlorohydrin was slowly added. During the addition, the reaction temperature was maintained below 60° C. by controlling the rate of epichlorohydrin addition. After all the epichlorohydrin was added, the solution was allowed to stir for one hour, and then brought to reflux for an additional three hours. The reaction mixture was then filtered under vacuum through a steam-jacketed Buchner funnel to remove the potassium chloride formed as a by-product. The filtration process was performed a total of three times to remove the majority of the salts. The reaction mixture was then placed in a one liter round bottom flask, and the remaining cyclohexane and unreacted nonylphenol were recovered by distillation, first at atmospheric pressure, then under vacuum at 0.2 mm Hg. The kettle temperature was not allowed to exceed 180° C. during the distillation to prevent discoloration of the product. The concentrated solution was then refiltered to give 275 grams of a paleyellow liquid. End-group MW analysis gave a molecular weight of 459.7 (theoretical MW=496.8). Ir and nmr spectra were identical to previously recorded spectra for the compound.

EXAMPLE 3 Preparation of 5 Mole Ethoxylate of 1,3-Bis(nonylphenoxy )-2-propanol

To a 500 milliliter, stainless steel, high pressure autoclave was charged 200 grams (0.40 mole) of 1,3-bis(nonylphenoxy)-2-propanol, which contained a catalytic mount of the potassium salt of the alcohol as described in Example 1. After purging the reactor with nitrogen, the alcohol was heated to 130° C. with stirring, and 86.9 grams (2.0 mole) of ethylene oxide was added over a two hour period. The reaction temperature and pressure were maintained from 130° C. to 140° C. and 60 psig during the course of the reaction. After the addition of ethylene oxide was complete, the reaction mixture was held at 140° C. for an additional hour to allow all the ethylene oxide to cook out. The reaction mixture was dumped while hot, under nitrogen, and neutralized with acetic acid to yield 285 grams of a pale-yellow liquid.

EXAMPLE 4 Preparation of Adduct of Nonylphenyl Glycidyl Ether and 5 Mole Ethoxylate of 1,3-Bis(nonylphenoxy)-2-propanol

To a five neck, one liter, round bottom flask equipped as in Example 1 was added 119.8 grams (0.17 mole) of the 5 mole ethoxylate of 1,3-bis(nonylphenoxy)-2-propanol and 100 milliliters of cyclohexane. The mixture was refluxed (100° C.) for one hour to remove residual water, and then cooled to 50° C. under nitrogen to add 0.5 grams of BF₃ /Et₂ O. Nonylphenyl glycidyl ether (46.0 grams, 0.17 mole) was then added to the flask over a one hour period, and the reaction was heated to reflux. After three hours at reflux, the reaction mixture was transferred to a separatory funnel, while hot, and washed with a saturated aqueous solution of sodium bicarbonate. The organic layer was separated from the water layer, and washed twice with hot deionized water. The washes were performed at 50° C. to facilitate the separation of the two layers. The water and cyclohexane were then evaporated from the organic layer, under vacuum, to yield. 145 grams of a pale-yellow, viscous liquid. End-group molecular weight analysis gave a molecular weight of 880 (theoretical molecular weight=993).

EXAMPLE 5 Preparation of Poly(nonylphenol glycidyl ether)

To a 500 milliliter round bottom equipped with an overhead stirrer, nitrogen inlet, reflux condenser, additional funnel, and temperature controller was charged 1.9 grams of ethanol (22 mmoles) and 200 grams of cyclohexane. The solution was brought to 50° C. Once heated, 0.5 milliliters (4 mmoles) of BF₃ /Et₂ O was added using a 2 milliliter syringe. Once the acid was added, 100.0 grams of nonylphenol glycidyl ether (362 mmoles) was added dropwise so as to maintain a reaction temperature of 45° C.-55° C. Once the glycidyl ether was added, the solution is refluxed for 3 hours, then cooled to about 50° C.

While hot (<60° C.) the organic was transferred to a separatory funnel and was washed once with 100 milliliters of 5% sodium bicarbonate solution. The aqueous layer was drained and the organic was washed two more times with 100 milliliter portions of deionized water. The aqueous layers were decanted and the organic was dried for at least 1 hour over magnesium sulfate. Once dry the magnesium sulfate was filtered from the organic which was stripped of solvent using a rotary evaporator. The final yield of viscous polymer was 100 grams. The GPC molecular weight was Mw=2600 and the Mn=1700 based on monodisperse polystyrene standards.

EXAMPLE 6 Ethoxylation of Poly(nonylphenol glycidyl ether)

To a 500 milliliter stainless steel Zipperclave was added 60.0 grams (0.035 moles based on an approximate molecular weight of 1700 gram/mole) of the resin prepared in Example 5 along with 0.5 grams of potassium hydroxide. The vessel was attached to an automated ethoxylation unit and was heated to 50° C. The vessel was continuously purged with nitrogen for 15 minutes and was then heated to 100° C. where it was again continuously purged with nitrogen for another 15 minutes. The vessel was then heated to 140° C. and was given a series of 6 purges by pressuring the vessel up to 80 psi, and then venting. Once the venting process was complete, the vessel was pressured to 20 psi with nitrogen.

The ethylene oxide lines were opened to the motor valves along with the main feed line on the Zipperclave. The feed was continued and the vessel pressure was regulated at 55 psi and a temperature of 140° C. The automation was designed to hold the temperature and the pressure within safe operating limits while addition of ethylene oxide proceeded through a pair of motor control valves. The feed was allowed to continue until 60.0 grams of ethylene oxide (1.362 moles) was added based on a difference weight of the feed cylinder. After the feed was complete, the reaction was allowed to continue for 1 hour after which the vessel was cooled to 60° C., purged 4 times with nitrogen to 80 psi and was dumped to a container. The final product yield was 115 grams with a theoretical yield of 120 grams. The GPC molecular weight of the product was Mw=3550 and the MN=2930 based on monodisperse polystyrene standards.

EXAMPLE 7 Preparation of Poly(phenyl glycidyl ether)

To a 500 milliliter round bottom equipped with an overhead stirrer, nitrogen inlet, reflux condenser, addition funnel, and temperature controller was charged 47.06 grams of phenol (500 mmoles) and 100 grams of toluene. The solution was brought to 50° C. Once heated, 1.0 milliliter (8 mmoles) of BF₃ / Et₂ O was added using a 2 milliliter syringe. Once the acid was added, 68.18 grams of phenyl glycidyl ether (454 mmoles) was added dropwise so as to maintain a reaction temperature of 45° C.-55° C. Once the glycidyl ether was added, the solution is refluxed for 3 hours, then cooled to about 50° C.

While hot (<60° C.) the organic was transferred to a separatory funnel and was washed once with 100 milliliters of 5% sodium bicarbonate solution. The aqueous layer was drained and the organic was washed two more times with 100 milliliter portions of deionized water. The aqueous layers were decanted and the organic was dried for at least 1 hour over magnesium sulfate. Once dry the magnesium sulfate was filtered from the organic which was stripped of solvent using a rotary evaporator. The final yield of viscous polymer was 90.3 grams (with 11% unreacted phenol). The GPC molecular weight was Mw=470 and the Mn=310 (on average a trimer) based on monodisperse polystyrene standards.

EXAMPLE 8 Preparation of 1,3-Bis(phenoxy)-2-propanol using the Cascading Polyol Technique

To a 1 liter round bottom flask equipped with an overhead stirrer, nitrogen inlet, reflux condenser, addition funnel, and temperature controller was charged 94.11 grams of phenol (1 mole), 12.86 grams of tetraethylammonium iodide (0.05 moles), 3.00 grams of water (0.17 moles), 42.08 grams of potassium hydroxide (0.75 moles), and 250 grams of toluene. To a 100 milliliter additional funnel was charged 23.13 grams of epichlorohydrin (0.25 moles) and 50 grams of toluene. The solution was brought to 65° C. at which time the epichlorohydrin solution was added over a period of 15 minutes while maintaining a reaction temperature of 65° C.±5° C. The reaction was allowed to proceed for 48 hours.

After 48 hours, the solution was cooled down to room temperature. The toluene solution was washed with two 250 milliliters portions of deionized water. The aqueous layers were drained off, and the toluene was removed along with unreacted phenol using a rotary evaporator. The final yield of product was 64.5 grams which was 106% of theory (residual is phenol). Final product purity was about 95% as shown by GPC.

EXAMPLE 9 Dimerization of 1,3-Bis(phenoxy)-2-propanol using the Cascading Polyol Technique

To a 250 milliliter round bottom flask equipped with an overhead stirrer, nitrogen inlet, reflux condenser, additional funnel, and temperature controller was charged 20.03 grams of 1,3-bis-(phenoxy)-2-propanol prepared in Example 8 (82 mmol of tetraethylammonium iodide (8 mmoles), 0.49 grams of water (27 mmoles), 6.51 grams of potassium hydroxide (116 mmoles), and 125 grams of toluene. To a 100 milliliter addition funnel was charged 3.61 grams of epichlorohydrin (39 mmoles) and 25 grams of toluene. The solution was brought to 65° C. at which time the epichlorohydrin solution was added over a period of 15 minutes while maintaining a reaction temperature of 65° C.±5° C. The reaction was allowed to proceed for 48 hours.

After 48 hours, the solution was cooled down to room temperature. The toluene solution was washed with two 250 milliliter portions of deionized water. The aqueous layers were drained off, and the toluene was removed using a rotary evaporator. The final yield of product was 21.6 grams which was 101% of theory, GPC showed two major components of the product. The first was the starting material at about 41% (Mn=220) and the second was the coupled product at about 59% (Mn=520).

EXAMPLE 10 Preparation of 1,3-Bis(hexadecyloxy)-2-propanol using the Cascading Polyol Technique

To a 500 milliliter round bottom flask equipped with an overhead stirrer, nitrogen inlet, reflux condenser, additional funnel, and temperature controller was charged 60.61 grams of hexadecanol (0.25 moles), 6.18 grams of tetraethylammonium iodide (0.024 moles), 1.44 grams of water (0.082 moles), 20.20 grams of potassium hydroxide (0.36 moles), and 125 grams of toluene. To a 100 milliliter addition funnel was charged 11.10 grams of epichlorohydrin (0.12 moles) and 25 grams of toluene. The solution was brought to 65° C. at which time the epichlorohydrin solution was added over a period of 15 minutes while maintaining a reaction temperature of 65° C.±5° C. The reaction was allowed to proceed for 48 hours.

After 48 hours, the solution was cooled down to room temperature. The toluene solution was washed with two 250 milliliter portions of deionized water. The aqueous layers were drained off, and the toluene was removed using a rotary evaporator. The final yield of product was 70.9 grams which is 109% of theory (residual is hexadecanol).

EXAMPLE 11 Sulfation of 1,3-Bis(nonylphenoxy)-2-propanol-block-(propylene oxide)₁₀ block-(ethylene oxide)₁₀

To a 250 milliliter round bottom flask equipped with an overhead stirrer, a temperature controller, and a vacuum adapter was added 75.0 grams of the material from Example 13 (49 mmoles). The kettle was then evacuated to <20 mmHg and heated to 100° C. to remove any water. After 1 hour, the kettle was cooled to 60° C. while under vacuum. When reaching 60° C., vacuum was broken with nitrogen and 5.3 grams of sulfamic acid (54 mmoles) was added. After charging the sulfamic acid, the kettle was heated to 110° C. and evacuated to <20 mmHg. The reaction was allowed to proceed for 3 hours.

At the end of the hold period, the kettle was cooled to 85° C. and vacuum was broken with nitrogen. 1.2 grams of diethanolamine (11 mmoles) was slowly added under a blanket of nitrogen. This solution was stirred for 30 minutes. 10 grams of ethanol was added to the kettle and the temperature was regulated to 55° C. This solution was stirred for 30 minutes. The heat was removed from the kettle and 30 grams of water along with 20 grams of ethanol were added while maintaining good agitation. The solution was stirred for 15 minutes or until cooled to room temperature (<35° C.).

The pH was checked by dissolving 2 grams of the product solution in 18 grams of deionized water. If the pH was below 6.5, 0.2 gram increments of diethanolamine was added until the pH is between 6.5 and 7.5.

EXAMPLE 12 Preparation of 1,3-Bis(nonylphenoxy)-2-propanol-block-(propylene oxide)₁₀

To a 500 milliliter stainless steel Zipperclave was added 100.0 grams (0,202 moles) of 1,3-bis(nonylphenoxy)-2-propanol prepared in Example 1 along with 0.7 grams of potassium hydroxide. The vessel was attached to an automated unit and was heated to 50° C. The vessel was continuously purged with nitrogen for 15 minutes and was then heated to 100° C. where it was again continuously purged with nitrogen for another 15 minutes. The vessel was then heated to 140° C. and is given a series of 6 purges by pressuring the vessel up to 80 psi, and then venting. Once the venting process was completed, the vessel was pressured to 20 psi with nitrogen.

Lines connected to a cylinder which had been precharged with 117.0 grams of propylene oxide (2.02 moles) were opened to the motor valves along with the main feed line on the Zipperclave. The feed was continued and the vessel pressure was regulated at 55 psi and a temperature of 140° C. The automation was designed to hold the temperature and the pressure within safe operating limits while addition of ethylene oxide proceeded through a pair of motor control valves. The feed was allowed to continue until all of the propylene oxide had been fed. After the feed was complete, the reaction was allowed to continue for 1 hour after which the vessel was cooled to 60° C., purged 4 times with nitrogen to 80 psi and was dumped to a container. The final product yield was 211 grams with a theoretical yield of 277 grams. The GPC molecular weight of the product was Mw=650 and the Mn=490 based on monodisperse polystyrene standards.

EXAMPLE 13 Preparation of 1,3-Bis(nonylphenoxy)-2-propanol-block-(propylene oxide)₁₀ -block-(ethylene oxide)₁₀

To a 500 milliliter stainless steel Zipperclave was added 75.0 grams of the propoxylate prepared in Example 12 (0.070 moles) along with 0.3 grams of potassium hydroxide. The vessel was attached to an automated ethoxylation unit and was heated to 50° C. The vessel was continuously purged with nitrogen for 15 minutes and was then heated to 100° C. where it was again continuously purged with nitrogen for another 15 minutes. The vessel was then heated to 140° C. and was given a series of 6 purges by pressuring the vessel up to 80 psi, and then venting. Once the venting process was completed, the vessel was pressured to 20 psi with nitrogen.

The ethylene oxide lines were opened to the motor valves along with the main feed line on the Zipperdave. The feed was continued and the vessel pressure was regulated at 55 psi and a temperature of 140° C. The automation was designed to hold the temperature and the pressure within safe operating limits while addition of ethylene oxide proceeded through a pair of motor control valves. The feed was allowed to continue until 30.7 grams ethylene oxide (0.696 moles) was added based on a difference weight of the feed cylinder. After the feed was complete, the reaction is allowed to continue for 1 hour after which the vessel was cooled to 60° C., purged 4 times with nitrogen to 80 psi and was dumped to a container. The final product yield was 99 grams with a theoretical yield of 106 grams.

EXAMPLE 14 Preparation of Bis(nonylphenoxy) Adduct of 1,4-Butanediol Diglycidyl Ether

To a five neck, two liter round bottom flask equipped with an addition funnel, thermometer, nitrogen dispersant tube, mechanical stirrer, and a decanting head with a water-cooled condenser were added 506.8 grams (2.30 mole) of nonylphenol and 350 milliliters of cyclohexane. The solution was heated to reflux, and 6.5 grams (1.3 weight percent based on nonylphenol) of potassium hydroxide in 15 milliliters of water was slowly added to the round bottom flask. After all the water was recovered in the decanting head (15 milliliters+2 milliliters formed), 220 grams (1.09 mole) of 1,4-butanediol diglycidyl ether was added dropwise between 60° and 80° C. After the addition was complete, the solution was refluxed for four hours. The contents of the flask were then washed with a five percent aqueous solution of phosphoric acid, and the organic layer was separated from the water layer and washed twice with deionized water. The reaction mixture was then placed in a one liter round bottom flask, and the remaining cyclohexane and unreacted nonylphenol were recovered by distillation, first at atmospheric pressure, then under vacuum at 0.2 mm Hg. The kettle temperature was not allowed to exceed 180° C. during the distillation to prevent discoloration of the product. The concentrated solution was then refiltered to give 710 grams of a pale-yellow liquid. Molecular weight by end-group MW analysis was 689.9 (theoretical MW=643.0). Ir and nmr spectra were consistent with the expected structure of the product.

EXAMPLE 15 Preparation of 3 Mole Ethoxylate of 1,3-Bis(nonylphenoxy)-2-propanol

To a five hundred milliliter Zipperdave reactor were charged, under nitrogen, 200.1 grams (0.43 mole) of 1,3-bis(nonylphenoxy)-2-propanol prepared in Example 2 and 0.20 grams (0.1 weight percent) of BF₃ / Et₂ O. The reaction mixture was heated to 80° C., and 55.1 grams (1.25 mole) of ethylene oxide was fed to the reactor over a two hour period. After all the ethylene oxide was fed, the reaction mixture was allowed to cook out for one hour and then dumped hot, under nitrogen, into a jar containing 160 milliliters of a one percent aqueous solution of sodium hydroxide. The organic layer was separated from the water layer and washed twice with deionized water. The washes were performed at 90° C. to facilitate the separation of the two layers. The product was then dried by azeotropic removal of the water, using cyclohexane (300 milliliters) as the entrainer. The cyclohexane was stripped off under vacuum to give a pale-yellow liquid with a molecular weight by end-group MW analysis of 601.7 (theoretical MW=629). Ir and nmr spectra were consistent with the expected structure of the product.

EXAMPLE 16 Preparation of 8 Mole Ethoxylate of Bis(nonylphenoxy) Adduct of 1,4-Butanediol Diglycidyl Ether

To a five hundred milliliter Zipperdave reactor were charged, under nitrogen, 150.2 grams (0.22 mole) of bis(nonylphenoxy) adduct of 1,4-butanediol diglycidyl ether prepared in Example 14 and 0.30 grams (0.2 weight percent) of BF₃ / Et₂ O. The reaction mixture was heated to 80° C., and 77.5 grams (1.76 mole) of ethylene oxide was fed to the reactor over a two hour period. After all the ethylene oxide was fed, the reaction mixture was allowed to cook out for one hour and then dumped hot, under nitrogen, into a jar containing 160 milliliters of a one percent aqueous solution of sodium hydroxide. The organic layer was separated from the water layer and washed twice with deionized water. The washes were performed at 90° C. to facilitate the separation of the two layers. The product was then dried by azeotropic removal of the water, using cyclohexane (300 milliliters) as the entrainer. The cyclohexane was stripped off under vacuum to give a pale-yellow liquid with a molecular weight by end-group MW analysis of 1047 (theoretical MW=995). Ir and nmr spectra were consistent with the expected structure of the product.

EXAMPLES 17 TO 21 Preparation of Propylene Oxide and Ethylene Oxide/Propylene Oxide Copolymers of 1,3-Bis(nonylphenoxy)-2-propanol

To a 500 milliliter stainless steel autoclave was charged an amount of potassium hydroxide and starter listed in Table A below. The vessel was heated to 50° C. The vessel was continuously purged with nitrogen for 15 minutes, and was then heated to 100° C., where it was again continuously purged with nitrogen for another 15 minutes. The vessel was then heated to 140° C., and was given a series of 6 purges by pressurizing the vessel up to 80 psi, and then venting. Once the venting process was completed, the vessel was pressurized to 20 psi with nitrogen. The feed lines from an oxide feed cylinder (containing a charge of ethylene oxide or propylene oxide as identified in Table A) to the autoclave were opened. The control system fed the oxide at a rate such that the vessel pressure was regulated at 55 psi and a temperature of 140° C. The reaction was allowed to continue for 1 hour past the end of the oxide feed. The vessel was cooled to 60° C., purged 4 times with nitrogen to 80 psi, and its contents were dumped into a tared container. The final theoretical and actual product yields and molecular weights determined by gel permeation chromatography are listed in Table A.

                                      TABLE A                                      __________________________________________________________________________      ##STR7##                                                                      Product     Starter                                                            Structure   Structure                                                                            grams                                                                               grams                                                                               grams                                                                              grams                                                                               Theory                                                                             Actual      Surface                   Example                                                                              x  y  x  y  Starter                                                                             KOH  PO  EO   yield                                                                              yield                                                                               Mn Mw  Tension.sup.a                                                                       CMC.sup.b            __________________________________________________________________________     17    10 40 10 0  50   0.3  0   82   132 127  2110                                                                              2340                                                                               43.3 .005                 18    10 70 10 0  50   0.3  0   145  193 188  2720                                                                              3050                                                                               47.1 .005                 19    20  0  0 0  50   0.5  117  0   167 162  1270                                                                              1530                                                                               .sup.c                                                                              .sup.c               20    20 40 20 0  50   0.3  0   54   104 104  2280                                                                              2570                                                                               42.6 .04                  21    20 70 20 0  50   0.3  0   99   149 145  2720                                                                              3060                                                                               44.2 .03                  __________________________________________________________________________      .sup.a --surface tension in dynes/cm at 1 wt. % copolymer in water             .sup.b --approximate critical micelle concentration                            .sup.c --water insoluble                                                 

EXAMPLES 22-33 Preparation of Poly(nonylphenyl glycidyl ether)

An amount of ethanol listed in Table B below, and 200 grams of cyclohexane were charged to a 500 milliliter round bottom flask equipped with an overhead stirrer, nitrogen inlet, reflux condenser, addition funnel, and temperature controller. The solution was heated to 50° C. after which an amount of boron trifluoride etherate listed in Table B was added. Subsequently, 100 grams of nonylphenyl glycidyl ether was added dropwise to the reaction mixture so as to maintain a reaction temperature of 45°-55° C. The solution was refluxed at 83° C. for an additional three hours after the completion of feed, and then cooled to 50° C. While hot (<60° C.), the organic material was transferred to a separatory funnel, and was washed once with 100 milliliters of 5% sodium bicarbonate solution. The aqueous layer was washed two more times with 100 milliliter portions of deionized water. The aqueous layers were decanted, and the organic layer was dried for at least 1 hour over magnesium sulfate. Once dry, the magnesium sulfate was filtered from the organic material, which was stripped of solvent using a rotary evaporator. The molecular weights of the polymer based on gel permeation chromatography are listed in Table B.

                  TABLE B                                                          ______________________________________                                                   mL        Grams                                                      Example   BF.sub.3 /Et.sub.2 O                                                                     Ethanol     Mn   Mw                                        ______________________________________                                         22        0.5       1.9         1700 2600                                      23        1.25      10.0         410  450                                      24        0.5       5.5          470  560                                      25        1.25      5.5          970 1150                                      26        1.25      1.0         1580 2530                                      27        2.0       5.5          900 1190                                      28        2.0       1.0         1470 2310                                      29        2.0       10.0         440  500                                      30        0.5       10.0         580  730                                      31        0.5       1.0         1750 2790                                      32        0.5       1.0         1740 2640                                      33        1.6       3.32        1170 1570                                      ______________________________________                                    

EXAMPLES 34-36 Preparation of Unsymmetric Biphobes

To a 500 milliter round bottom flask equipped with an overhead stirrer, nitrogen inlet, reflux condenser, addition funnel, and temperature controller was charged an amount of starting alcohol listed in Table C below. The material was heated to 170° C. under nitrogen sparge, after which an amount of potassium hydroxide listed in Table C was added. An amount of epoxide listed in Table C was fed to the reaction flask using an FMI feed pump at a rate such that addition of the epoxide was completed in 6 hours. Gel permeation chromatography showed that the purity of the biphobic product was greater than 90%.

                                      TABLE C                                      __________________________________________________________________________      ##STR8##                                                                                   Gms  Gms              Grams                                       Ex. Alcohol  Alch.                                                                               KOH  Epoxide     Epoxide                                                                              R1       R2                           __________________________________________________________________________     34  nonylphenol                                                                             100  2    1,2 epoxyhexadecane                                                                        108.6 nonylphenoxy                                                                            tridecyl                     35  dodecylphenol                                                                           100  2    1,2 epoxyhexadecane                                                                         91.1 dodecylphenoxy                                                                          tridecyl                     36  dodecylphenol                                                                            50  1    nonylphenyl  52.7 dodecylphenoxy                                                                          nonylphenoxy                                        glycidyl ether                                          __________________________________________________________________________

EXAMPLE 37 Preparation of Poly(1,2-epoxyhexadecane)

The process described in Examples 34-36 was used with 50 grams of 1-hexadecanol, 1 gram of potassium hydroxide, and 49.4 grams of 1,2 epoxyhexadecane. The product multiphobe had a composition of 10% hexadecanol, 55.5% biphobe (i.e., 1-hexadecoxy-2-hexadecanol), 27.7% triphobe, and 6.5% quadphobe, as determined by gel permeation chromatography.

EXAMPLE 38 Preparation of an Unsaturated Poly(nonylphenyl glycidyl ether)

To a 500 milliliter round bottom flask equipped with an overhead stirrer, nitrogen inlet, reflux condenser, addition funnel, and temperature controller was charged 10 grams of allyl alcohol, 40 grams of toluene, 0.5 grams of potassium hydroxide, and 2 grams of deionized water. The reaction mixture was refluxed to dryness, and cooled to 60° C. Once cool, 47.6 grams of nonylphenyl glycidyl ether was fed to the reaction vessel using a FMI pump over 35 minutes. The reaction mixture was heated to 112° C., and refluxed for 3 hours. The solvent was removed from the reaction mixture by vacuum stripping. The product was cooled and recovered. The product composition was 15% allyl alcohol, 43% biphobe (e.g., 1-(2-propene-1-oxy)-3-nonylphenoxy-2-propanol) and 42% triphobe, as determined by gel permeation chromatography.

EXAMPLE 39 Solventless Macromonomer Preparation

To a 3 liter round bottom flask equipped with an overhead stirrer, nitrogen inlet and sparging tube, water cooled reflux condenser, monomer addition tube, FMI pump and feed tank, and heating mantel and temperature controller, 2000 grams of previously melted surfactant S-2 were charged. The materials were heated to 85° C. under nitrogen sparge and mixing, and held at temperature for 1 hour to drive off residual water. Then 0.05 grams of 4-methoxyphenol were added, and the mixture was sparged with air for 15 minutes to activate the inhibitor. 2.4 grams of dibutyl tin dilaurate were added, and after 15 minutes of mixing, 201.25 grams of TMI were fed over 45 minutes. The mixture was held at 85° C. for another 4 hours. Then 243 grams of water was pumped into the reaction mixture over a 25 minute period to wash the feed lines of isocyanate, and to dilute the product macromonomer to 90% solids. The product macromonomer was cooled and collected in a 1 gallon jug.

EXAMPLE 40 Preparation of Macromonomer Compound

Into a 1 liter round bottom reaction flask equipped with a heating mantle, dean stark trap, condenser, thermometer, nitrogen bubbler, nitrogen purge line and stirrer was charged 300 grams of toluene and 63 grams of a surfactant identified as S-1 in Table D below. With nitrogen purge, the resulting solution was heated to reflux at approximately 110° C. and azeotroped to remove trace water to dryness. The solution was subsequently cooled to 90° C., and 1.5 grams of bismuth hex them 28% bismuth octoate catalyst (Mooney Chemical, Inc., Cleveland, Ohio) was charged and allowed to mix well, after which a stoichiometric mount of 95% m-TMI aliphatic isocyanate (American Cyanamid, Stamford, Conn.) was charged. After the reaction proceeded at 90° C. for 1.3 hours, the resulting product was cooled to 70° C. and 0.03 grams of 2,6-di-tert-4-methyl phenol (BHT) preservative was added. The mixture was poured into a stainless steel pan with large surface area to facilitate drying. The final product was a waxy material, and is designated herein as macromonomer M-1.

                  TABLE D                                                          ______________________________________                                          ##STR9##                                                                                                       Moles of                                      Surfactant                                                                             R.sub.1     R.sub.2 /R.sub.3                                                                            Ethoxylation                                  ______________________________________                                         S-1     Nonylphenol Hydrogen (R.sub.2)                                                                          40                                            S-2     Nonylphenol Nonylphenol (R.sub.3)                                                                       40                                            S-3     Nonylphenol Nonylphenol (R.sub.3)                                                                       20                                            S-4     Nonylphenol Octylphenol (R.sub.3)                                                                       20                                            S-5     Nonylphenol Octylphenol (R.sub.3)                                                                       40                                            S-6     Nonylphenol Nonylphenol (R.sub.3)                                                                       80                                            S-7     Nonylphenol Nonylphenol (R.sub.3)                                                                       120                                           S-8     Nonylphenol Nonylphenol (R.sub.3)                                                                       20                                            S-9     Dinonylphenol                                                                              Hydrogen (R.sub.2)                                                                          50                                             S-10   Nonylphenol Hydrogen (R.sub.2)                                                                          50                                            ______________________________________                                    

EXAMPLES 41-62 Preparation of Macromonomer Compounds

In a manner similar to that described in Example 40, other macromonomers were prepared using stoichiometric amounts of the surfactants and unsaturated compounds identified in Table E below.

                  TABLE E                                                          ______________________________________                                         Example                                                                               Surfactant                                                                               Unsaturated     Macromonomer                                  No.    Designation                                                                              Compound        Designation                                   ______________________________________                                         41     S-2       m-TMI           M-2                                           42     S-3       m-TMI           M-3                                           43     S-4       m-TMI           M-4                                           44     S-5       m-TMI           M-5                                           45     S-6       m-TMI           M-6                                           46     S-7       m-TMI           M-7                                           47     S-2       Isocyanate Ethyl                                                                               M-8                                                            Methacrylate                                                  48     S-5       Isocyanate Ethyl                                                                               M-9                                                            Methacrylate                                                  49     S-1       Methacrylic Anhydride                                                                          M-10                                          50     S-2       Methacrylic Anhydride                                                                          M-11                                          51     S-5       Methacrylic Anhydride                                                                          M-12                                          52     S-6       Methacrylic Anhydride                                                                          M-13                                          53     S-2       Acrylic Anhydride                                                                              M-14                                          54     S-5       Acrylic Anhydride                                                                              M-15                                          55     S-6       Acrylic Anhydride                                                                              M-16                                          56     S-2       Crotonic Anhydride                                                                             M-17                                          57     S-5       Maleic Anhydride                                                                               M-18                                          58     S-8       m-TMI           M-19                                          59     S-9       m-TMI           M-20                                          60      S-10     m-TMI           M-21                                          61     S-2       Methacrylol Isocyanate                                                                         M-22                                          62     S-6       Methacrylol Isocyanate                                                                         M-23                                          ______________________________________                                    

EXAMPLE 63 Preparation of Alkali Soluble Thickener

A monomer mixture was prepared by charging 150 grams of ethyl acrylate (Aldrich), 120 grams of methacrylic acid (Aldrich), 13 grams of a 75% solution of Aerosol TO surfactant (American Cyanamid), 30 grams of macromonomer M-19, 3.0 grams of 2-sulfoethyl methacrylate (Hampshire Chemical), and 50 grams of distilled deionized water to a bottle, and dispersing the contents with vigorous shaking. To a two liter jacketed resin flask equipped with a four-bladed stainless steel mechanical stirrer, Claisen connecting tube, Friedrichs water condenser, nitrogen sparge and bubble trap, thermometer, and monomer addition inlets 872 grams of water were added. Under nitrogen purge, the reaction was heated to 80° C. by circulating temperature controlled water through the reactor jacket. 0.55 gram of sodium persulfate initiator (Aldrich) was charged to the reactor. Five minutes later, 36 grams of the monomer mixture were added to the reactor. The remainder of the monomer mixture was charged to a one-liter graduated monomer feed cylinder. After allowing the initial monomer charge to react for twenty minutes to form a seed latex, the remaining monomer feed mixture was conveyed to the reaction vessel over a two hour period by FMI pumps via 1/8" Teflon tubing while the reaction mixture was continuously stirred at a reaction temperature held between 76°-82° C. The reaction was allowed to proceed for another quarter hour, after which 0.1 gram of tert-butyl hydroperoxide (Aldrich) and sodium formaldehyde sulfoxylate (Royce) in 6 grams of water were added to the latex to reduce residual monomer. The reaction was allowed to proceed for an additional 75 minutes. The product 25% solids content latex was then cooled and filtered with a 100 mesh nylon cloth. The coagulum collected from the reaction vessel and filter cloth was dried in an oven at 140° C. Table F presents the mass of dried coagulum expressed as a percentage of total weight of monomer used in the reaction. The resulting latex had a pH of 3.8, had a mean particle volume diameter of 72 rim with a polydispersity ratio of 1.06, as determined by light scattering. The mechanical stability of the latex was determined by shearing 200 grams of the latex in a Waring® blender for 10 minutes, after which the latex sample was filtered with a 100 mesh nylon cloth. The coagulum collected from the blender and filter cloth was dried in an oven at 140° C. Table F presents the amount of dried coagulum expressed as a percentage of total weight of latex solids in the test sample.

EXAMPLES 64-99 Preparation of Alkali Soluble Thickeners

In a manner similar to that described in Example 63, other alkali soluble thickeners were prepared using the monomers identified in Tables F-K below in the amounts identified in Tables F-K. The composition of the monomer mixture, the solids content of the latex, and the amount and distribution of the initiator in the process were varied. When a delayed initiator feed was used, the initiator was dissolved in 50 grams of water contained in a syringe pump, and the 50 grams of water used in the monomer mixture in the process described above was omitted. The delayed catalyst feed lasted thirty minutes longer than the period required for monomer addition. The percentage of 2-sulfoethyl methacrylate, 3-sulfopropyl methacrylate and 3-sulfopropyl acrylate described in Tables F-K is based on the total weight of the monomer mixture, excluding the sulfonic acid based (meth)acrylate monomer.

The sodium salt of 2-sulfoethyl methacrylate was prepared in the following manner. To a beaker situated in a water and ice bath at 0° C., 72 grams of water were added, and 18 grams of 2-sulfoethyl methacrylate were added drop-wise. After mixing and dissolution of the 2-sulfoethyl methacrylate, 8.22 grams of 0.5 normal sodium hydroxide solution was added drop-wise until the pH of the mixture reached 7.1. The resulting 18.3% solution of the sodium salt of 2-sulfoethyl methacrylate was used immediately in emulsion polymerization. The sodium and potassium salts of other sulfuric acid based (meth)acrylate monomers were prepared in a similar manner.

The initiator concentration (grams per 300 grams of monomer) used in preparation of the alkali soluble thickeners in Tables F-K was as follows (initiator initial/fed): 0.55/0 for Examples 64-67 and Controls A and B; 0.77/0 for Examples 68-72; 0.26/0.52 for Examples 73-75; 0.26/0.53 for Examples 76 and 77; 0.53/0 for Example 78; 0.77/0 for Examples 79-82 and Control C; 0.26/0.51 for Example 83 and Control D; and 0.24/0.48 for Examples 84, 86 and 87 and Control E; and 0.48/0.00 for Examples 85, 88-99 and Controls F, G and H.

As used in Tables F-K below, the following abbreviations have the indicated meanings: MM=macromonomer; EA=ethyl acrylate; MAA=methacrylic acid; 2-SEM=2-sulfoethyl methacrylate; 3-SPM=3-sulfopropyl methacrylate; 3-SPA=3-sulfopropyl acrylate; SSS=sodium styrene sulfonate; TDM=tert-deodecyl mercaptan; and 2-HEA=2-hydroxy ethyl acrylate.

                                      TABLE F                                      __________________________________________________________________________     Thickener Composition by Weight                                                                                     Polymer                                                                             Mechanical                           Example                                                                             Macromonomer                                                                           % MM                                                                               % MAA                                                                               % EA                                                                               % Other    Scrap %                                                                             Stability %                          __________________________________________________________________________     3    M-19    10  40   50  1% 2-SEM   0.10 7.5                                  64   M-19    10  40   50  0.5% 2-SEM 0.21 12.2                                 65   M-19    10  40   50  1.5% 2-SEM 0.12 0.9                                  66   M-19    10  40   50  2.0% 2-SEM 0.06 0.7                                  67   M-19    10  40   50  1.0% 3-SPM (K salt)                                                                       0.10 --                                   68   M-19    10  40   50  1.0% 3-SPA (K salt)                                                                       0.71 --                                   69   M-19    10  40   50  1.0% 3-SPM (K salt)                                                                       0.43 --                                   70   M-19    10  40   50  1.0% 2-SEM (35%                                                                           1.13 --                                                             solids)                                              71   M-19    10  40   50  1.0% 2-SEM 0.51 --                                   72   M-19    10  40   50  1.0% 2-SEM (Na salt)                                                                      0.88 --                                   73   M-19    10  40   50  1.0% 2-SEM 0.35 0.14                                 74   M-19    10  40   50  1.0% 3-SPM (K salt)                                                                       1.13 0.26                                 75   M-19    10  40   50  1.0% 2-SEM (Na salt)                                                                      0.65 0.22                                 76   M-19    10  40   50  1.0% 2-SEM.sup.(a)                                                                        0.05 0                                    77   M-19    10  40   50  1.0% 2-SEM.sup.(b)                                                                        0.17 0.01                                 78   M-19    10  40   50  1.0% 2-SEM.sup.(c)                                                                        0.09 0.003                                A    M-19    10  40   50  None       8.67 9.74                                 B    M-19    10  40   50  1.0% SSS   0.98 --                                   __________________________________________________________________________      .sup.(a) Fed 0.50 gram of sodium bicarbonate in delayed initiator stream.      .sup.(b) 0.50 gram of sodium bicarbonate in reactor charge.                    .sup.(c) 0.75 gram of sodium bicarbonate in reactor charge with one shot       initiator process.                                                       

                                      TABLE G                                      __________________________________________________________________________     Thickener Composition by Weight                                                                                     Polymer                                                                             Mechanical                           Example                                                                             Macromonomer                                                                           % MM                                                                               % MAA                                                                               % EA                                                                               % Other    Scrap %                                                                             Stability %                          __________________________________________________________________________     79   M-6     12.5                                                                               35   52.5                                                                               0.5% 2-SEM 0.31 --                                   80   M-6     12.5                                                                               35   52.5                                                                               1.0% 2-SEM 0.31 --                                   81   M-6     12.5                                                                               35   52.5                                                                               2.0% 2-SEM (K salt)                                                                       0.13 0.01                                 82   M-6     12.5                                                                               35   52.5                                                                               1.0% 2-SEM (K salt)                                                                       0.08 --                                   C    M-6     12.5                                                                               35   52.5                                                                               None       0.73 96.4                                 __________________________________________________________________________

                                      TABLE H                                      __________________________________________________________________________     Thickener Composition by Weight                                                                                       Polymer                                                                             Mechanical                         Example                                                                             Macromonomer                                                                           % MM                                                                               % MAA                                                                               % EA                                                                               % 2-HEA                                                                              % Other                                                                               Scrap %                                                                             Stability %                        __________________________________________________________________________     83   M-2     30  40   27.5                                                                               2.5   1.0% 2-SEM                                                                            0.30 --                                 D    M-2     30  40   27.5                                                                               2.5   None   1.00 --                                 __________________________________________________________________________

                                      TABLE I                                      __________________________________________________________________________     Thickener Composition by Weight                                                                                       Polymer                                                                             Mechanical                         Example                                                                             Macromonomer                                                                           % MM                                                                               % MAA                                                                               % EA                                                                               % TDM                                                                               % Other Scrap %                                                                             Stability %                        __________________________________________________________________________     84   M-20    30  40   30  0.3  1.0% 3-SPM                                                                             0.03 0                                                                 (K salt).sup.(a)                                85   M-20    30  40   30  0.3  1.0% 3-SPM                                                                             0.05 0                                                                 (K salt).sup.(b)                                86   M-20    30  40   30  0.3  1.0% 2-SEM.sup.(c)                                                                     0.06 0                                  87   M-20    30  40   30  0.3  1.0% 2-SEM.sup.(d)                                                                     0.01 0                                  88   M-20    30  40   30  0.3  0.25% 2-SEM.sup.(c)                                                                    0.38 12.0                               89   M-20    30  40   30  0.3  0.25% 2-SEM.sup.(d)                                                                    0.39 40.0                               90   M-20    30  40   30  0.3  0.5% 2-SEM.sup.(c)                                                                     0.46 0.22                               91   M-20    30  40   30  0.3  0.5% 2-SEM.sup.(d)                                                                     0.00 0.06                               92   M-20    30  40   30  0.3  0.5% 2-SEM.sup.(d)                                                                     0.00 0.00                                                              1.0% Sodium                                                                    Bicarbonate                                     93   M-20    30  40   30  0.3  1.0% 2-SEM.sup.(c)                                                                     0.05 0.00                               94   M-20    30  40   30  0.3  1.0% 2-SEM.sup.(c)                                                                     0.02 0.00                                                              0.25% Sodium                                                                   bicarbonate in                                                                 reactor charge                                  95   M-20    30  40   30  0.3  1.0% 2-SEM.sup.(c)                                                                     0.01 0.00                                                              0.25% Sodium                                                                   bicarbonate in                                                                 monomer mix                                     96   M-20    30  40   30  0.3  2.0% 2-SEM.sup.(c)                                                                     0.00 0.00                               97   M-20    30  40   30  0.3  2.0% 2-SEM.sup.(d)                                                                     0.00 0.00                               E    M-20    30  40   30  0.3  None    0.79 100                                F    M-20    30  40   30  0.3  None    0.75 100                                __________________________________________________________________________      .sup.(a) 25% total solids.                                                     .sup.(b) 43% total solids.                                                     .sup.(c) In monomer mix; 25% total solids.                                     .sup.(d) In reactor charge; 25% total solids.                            

                                      TABLE J                                      __________________________________________________________________________     Thickener Composition by Weight                                                                                     Polymer                                                                             Mechanical                           Example                                                                             Macromonomer                                                                           % MM                                                                               % MAA                                                                               % EA                                                                               % Other    Scrap %                                                                             Stability %                          __________________________________________________________________________     98   M-20    30  40   30  1.0% 3-SPM (K salt)                                                                       0.06 0                                    G    M-20    30  40   30  None       1.59 --                                   __________________________________________________________________________

                                      TABLE K                                      __________________________________________________________________________     Thickener Composition by Weight                                                                                      Polymer                                                                             Mechanical                          Example                                                                             Macromonomer                                                                           % MM                                                                               % MAA                                                                               % EA                                                                               % TDM                                                                               % Other                                                                               Scrap %                                                                             Stability %                         __________________________________________________________________________     99   M-21    15  35   50  0.2  1.0% 3-SPM                                                                            0.01 0                                   H    M-21    15  35   50  0.2  None   0.44 --                                  __________________________________________________________________________

Although the invention has been illustrated by certain of the preceding examples, it is not to be construed as being limited thereby; but rather, the invention encompasses the generic area as hereinbefore disclosed. Various modifications and embodiments can be made without departing from the spirit and scope thereof. 

We claim:
 1. A method for reducing plating and/or grit formation in a process for preparing an aqueous polymer emulsion useful as a thickening agent in aqueous compositions, which comprises copolymerizing in aqueous emulsion:(a) about 1-99.8 weight percent of one or more alpha, beta-monoethylenically unsaturated carboxylic acids; (b) about 0-98.8 weight percent of one or more monoethylenically unsaturated monomers different from component (a); (c) about 0.1-98.9 weight percent of one or more monoethylenically unsaturated macromonomers different from components (a) and (b); (d) about 0-20 weight percent or greater of one or more polyethylenically unsaturated monomers different from components (a), (b) and (c); and (e) one or more acrylates and/or methacrylates derived from a strong acid or a salt of a strong acid different from components (a), (b), (c) and (d) in an amount sufficient to reduce plating and/or grit formation in said process, said strong acid comprising an acid fully dissociated at a pH of
 2. 2. The method of claim 1 which is carried out in the presence of a buffer in an amount sufficient to reduce plating and/or grit formation in said method.
 3. The method of claim 2 wherein the buffer is present in an amount of from about 0.01 to about 1.0 weight percent or greater. 